SIST EN 300 419 V1.2.1:2003
(Main)Access and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Connection characteristics
General Information
- Abstract
Specification of the performance requirement for the connection through the public network, including test procedures for compliance. revision of ETS 300 419 to improve the safety related aspects following a liaison received from TC Safety.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
Overview
SIST EN 300 419 V1.2.1:2003 sets out the technical performance requirements and compliance testing procedures for 2 048 kbit/s digital structured leased lines (D2048S) under the Open Network Provision (ONP) framework. This European standard ensures harmonization of digital leased line characteristics, supporting efficient and reliable connectivity across public telecommunications networks. The document, developed by the Slovenski inštitut za standardizacijo (SIST) and based on ETSI EN 300 419, reflects updates for enhanced safety following guidance from technical committees and aligns with EU directives on telecommunications.
Key Topics
- Connection Characteristics: Defines key attributes for structured leased lines, focusing on transfer rates, structure, performance, symmetry, and error limits.
- Frame Structure: Outlines the use of an 8 kHz framing structure over the 2 048 kbit/s channel, adhering to ITU-T Recommendations G.704 and G.706.
- Network Termination Points (NTPs): Technical specification for interfaces and equipment connected at the user-network boundary.
- Performance Requirements: Includes criteria for:
- Transfer rate (2048 kbit/s, with a nominal information rate of 1984 kbit/s)
- Error performance (e.g., Errored Seconds (ES), Severely Errored Seconds (SES), Background Block Errors (BBE))
- Transmission delay and jitter
- Controlled slip and symmetry
- Test Methods: Provides principles for compliance tests including loop-back, delay, jitter, and error performance measurement.
- Safety Considerations: Incorporates revised safety requirements for leased line deployment and operation.
Applications
The standard is essential for:
- Telecommunications Operators: Assuring consistency and interoperability of digital structured leased line services across different networks and countries.
- Network Equipment Manufacturers: Designing and testing digital access and terminal equipment for compliance with ONP requirements, ensuring reliable service delivery.
- Enterprises and Service Providers: Procuring and deploying standards-compliant leased lines for mission-critical voice, data, or integrated digital communications.
- Regulatory Bodies: Assessing service quality, safety, and adherence to EU telecommunication directives and guidelines for public network access.
Practical Benefits
- Interoperability: Harmonized technical characteristics facilitate seamless cross-border and multi-vendor operations.
- Reliable Performance: Specified limits for error rates and delays ensure high-quality digital transmission, vital for real-time and data-intensive applications.
- Efficient Troubleshooting: Structured test procedures and in-service monitoring enable rapid detection and resolution of network impairments.
- Safety: Updated safety guidance reduces deployment risks and improves network resilience.
Related Standards
For complete interoperability and integration, the following standards are closely related to SIST EN 300 419 V1.2.1:2003:
- EN 300 418: Network interface presentation for 2 048 kbit/s leased lines (structured and unstructured).
- EN 300 420: Terminal equipment interface for 2 048 kbit/s structured leased lines.
- ITU-T G.704 and G.706: International recommendations for framing and structure of digital channels.
- ITU-T O.151, O.153, O.171: Test methodologies for digital error performance and jitter measurements.
Keywords: 2 048 kbit/s, digital leased lines, ONP, structured connection, telecommunications standard, compliance testing, error performance, network interface, public network, PSTN, terminal equipment, safety, ETSI, SIST.
By adopting the requirements of SIST EN 300 419 V1.2.1:2003, stakeholders in the telecommunications sector ensure robust, scalable, and safe digital leased line services, supporting Europe’s vision for open and interconnected digital infrastructure.
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Frequently Asked Questions
SIST EN 300 419 V1.2.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Access and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Connection characteristics". This standard covers: Specification of the performance requirement for the connection through the public network, including test procedures for compliance. revision of ETS 300 419 to improve the safety related aspects following a liaison received from TC Safety.
Specification of the performance requirement for the connection through the public network, including test procedures for compliance. revision of ETS 300 419 to improve the safety related aspects following a liaison received from TC Safety.
SIST EN 300 419 V1.2.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.040.50 - Lines, connections and circuits. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 419 V1.2.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Access and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Connection characteristics33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 419 Version 1.2.1SIST EN 300 419 V1.2.1:2003en01-december-2003SIST EN 300 419 V1.2.1:2003SLOVENSKI
STANDARD
ETSIEN300419V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);ConnectioncharacteristicsSIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)2ReferenceREN/AT-020019Keywordsaccess,digital,leasedline,network,ONP,testing,UNIETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.94Requirements.94.1Attributes.104.1.1Transferrate.114.1.1.1Leasedlinetiming.114.1.1.2Informationtransferrate.114.1.2Informationtransfersusceptance.114.1.3Structure.114.1.3.1CRC-4.114.1.3.2UseoftheE-bits.124.1.3.3Framesynchronizationanddatatransmissioncapability.124.1.3.3.1Multiframealignment.124.1.3.4UseoftheA-bit.124.1.3.5UseoftheSabits.134.1.4Establishmentofconnection.134.1.5Symmetry.134.1.6Connectionconfiguration.134.1.7Networkperformance.134.1.7.1Transmissiondelay.134.1.7.2Jitter.144.1.7.2.1Jittertoleranceatthenetworkinputport.144.1.7.2.2Maximumjitteratthenetworkoutputport.144.1.7.3Controlledslip.154.1.7.4Error.154.1.7.4.1BringingIntoService(BIS)limits.154.1.7.4.2Performancelevel.154.1.7.5Availability.15AnnexA(normative):Testmethods.16A.1General.16A.1.1Equipmentconnection.16A.1.2Sequenceofperformingthetests.16A.2Testmethods.16A.2.1Informationtransferrate,susceptanceandsymmetry.16A.2.2Delay.17A.2.3Jitter.18A.2.4Errorandslip.19A.2.5Structure.20A.2.5.1OutputstructureandCRC-4generation.20A.2.5.2UseoftheE-bits.21A.2.5.3Framesynchronizationanddatatransmissioncapability.21A.2.5.4Multiframealignment.23AnnexB(normative):Definitionofframestructure.24SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)4B.1Framestructure.24B.2CRC-4.24B.2.1CRC-4generation.25B.2.2CRC-4monitoring.25AnnexC(informative):Derivationoferrorperformancelimits.26C.1Introduction.26C.2Referenceconnections.26C.2.1Terrestrialconnection.26C.2.2Satelliteconnection.27C.3Errorperformanceobjectives.27C.4Long-termerrorperformance.28AnnexD(informative):Availability.29D.1General.29D.1.1Unavailability.29D.1.2Outageintensity.29D.1.3Meantimebetweenfailures.29D.1.4Meantimetorestoreservice.29D.2Recommendations.29AnnexE(informative):Bibliography.31History.32SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeAccessandTerminals(AT).ThepresentdocumentresultedfromamandatefromtheCommissionoftheEuropeanCommunity(CEC)toprovidestandardsforsupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Therearetwootherstandardsdirectlyrelatedtothepresentdocument:-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation";-EN300420:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)6IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC,laterreplacedby98/13/EC,terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ITU-TRecommendationI.340forIntegratedServicesDigitalNetwork(ISDN)connectiontypeswasusedasabasisfortheconnectioncharacteristics.ETS300167andITU-TRecommendationsG.704andG.706areusedasthebasisforthestructure.SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesforconnectioncharacteristicsofOpenNetworkProvision(ONP)2048kbit/sdigitalstructuredleasedlines.Theleasedlineoperatesat2048kbit/sandprovidesaninformationtransmissioncapability,withoutrestrictiononbinarycontent,of1984kbit/s.Theremaining64kbit/sprovidesan8kHzframingstructureinaccordancewithETS300167andITU-TRecommendationsG.704andG.706.AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTPs)andincludesanyequipmentthatmayprovidetheNTP.Signalsbetweenterminalequipmentsaresubjecttoimpairmentsduringtheirtransferovertheconnection.Thelimitstotheseimpairmentsarestatedinthepresentdocument.Togetherwiththecompanionstandard,EN300418[4]definingthenetworkinterfacepresentation,thepresentdocumentdescribesthetechnicalcharacteristicsoftheleasedlineserviceofferedtotheuser.Thetestsspecifiedinthepresentdocumentcannotbecarriedoutbytheleasedlineprovider,whiletheleasedlineisinservice,i.e.carryingusers'traffic.Thusthetestsaredesignedforbringingintoandreturningintoservice,althoughthereisnoobligationtoperformthesetestseachtimealeasedlineisbroughtintoorreturnedintoservice.However,becausetheconnectionisstructured,theerrorperformancemaybemonitoredbytheleasedlineproviderwhilethelineisinservice.Thepresentdocumentisapplicableforleasedlines,includingparttimeleasedlines,forwhichtheestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNTP.Thepresentdocumentspecifiesthecompliancetestsfortheconnectionrequirements.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetests,nordoesitincludeinformationonanyrelevantregulations.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublicationand/oreditionnumberorversionnumber)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimarybitrateandabove".[2]ITU-TRecommendationO.153(1992):"Basicparametersforthemeasurementoferrorperformanceatbitratesbelowtheprimaryrate".[3]ITU-TRecommendationO.171(1997):"Timingjitterandwandermeasuringequipmentfordigitalsystemswhicharebasedontheplesiochronousdigitalhierarchy(PDH)".[4]ETSIEN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)83Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:BackgroundBlockError(BBE):erroredblocknotoccurringaspartofaSeverelyErroredSecond(SES)BBEratio:ratiooferroredblockstototalblocksduringafixedmeasurementintervalexcludingallblocksduringseverelyerroredsecondsandwhiletheleasedlineconnectionisintheunavailablestate(seeITU-TRecommendationG.826)block:setof2048consecutivebitsequivalenttooneSub-MultiFrame(SMF).EachblockismonitoredbymeansofaCyclicRedundancyCheck-4bit(CRC-4)errorcheck.Thelengthofeachblockcorrespondstoaperiodof1msNOTE:ThisdefinitionisrelevantonlytothepresentdocumentandismorespecificthanthegenericdefinitiongiveninITU-TRecommendationG.826.controlledslip:irretrievablelossorgainofasetofconsecutivedigitpositionsinadigitalsignal,inwhichboththemagnitudeandinstantofthatlossorgainarecontrolled,toenablethesignaltoaccordwitharatedifferentfromitsownerroredblock:blockinwhichoneormorebitsareinerror(seeITU-TRecommendationG.826)ErroredSecond(ES):one-secondperiodwithoneormoreerroredblocks(seeITU-TRecommendationG.826)ESratio:ratioofEStototalsecondsduringafixedmeasurementinterval.TheESratioisnotevaluatedwhiletheleasedlineconnectionisintheunavailablestate(seeITU-TRecommendationG.826)erroredSub-MultiFrame:Sub-MultiFrame(SMF)wherethecalculatedCRC-4doesnotcorrespondwiththeCRC-4containedwithinthenextSMF(seeclauseB.2.2)frame:sequenceof256bitsofwhichthefirst8bitsdefinetheframestructure(seeannexB)frameslip:slipofonecompleteframeleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweenNTPsandthatdonotincludeswitchingfunctionsthattheusercancontrol(e.g.on-demandswitching)multiframe:sequenceoftwoSMFscontainingthemultiframealignmentword(seeannexB)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccessto,andefficientcommunicationthrough,thatpublicnetworkPRBS(29-1):PseudoRandomBitSequence(PRBS)(asdefinedinclause2.1ofITU-TRecommendationO.153[2])PRBS(215-1):PRBS(asdefinedinclause2.1ofITU-TRecommendationO.151[1])Sabits:bits4to8(bitsSa4toSa8)inframesnotcontainingtheframealignmentsignal(seeannexB)satellitetransmission:transmissionviaanearthorbitingsatelliteseverelydisturbedperiod:forout-of-servicemeasurements,aseverelydisturbedperiodoccurswhen,overaperiodoftimeequivalenttofourcontiguousblocks,eitherallthecontiguousblocksareaffectedbyahighbiterrordensityof=10-2,oralossofsignalisobserved.Forin-servicemonitoringpurposes,aseverelydisturbedperiodisestimatedbytheoccurrenceoflossofsignalorlossofframealignment(seeITU-TRecommendationG.826)SeverelyErroredSecond(SES):one-secondperiodwhichcontains=805erroredblocksoratleastoneseverelydisturbedperiod(seeITU-TRecommendationG.826)SESratio:ratioofSEStototalsecondsduringafixedmeasurementinterval.TheSESratioisnotevaluatedwhiletheleasedlineconnectionisintheunavailablestate(seeITU-TRecommendationG.826)SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)9Sub-MultiFrame(SMF):sequenceof8frames,eachof256bits,overwhichtheCRC-4iscalculated(seeannexB)uncontrolledslip:lossorgainofadigitpositionorasetofconsecutivedigitpositionsinadigitalsignal,resultingfromanaberrationofthetimingprocessesassociatedwithtransmissionorswitchingofadigitalsignal,andinwhicheitherthemagnitudeortheinstantofthatlossorgainisnotcontrolledunavailabilityperiod:unavailabilityperiodbeginsattheonsetof10consecutiveSES.These10sareconsideredtobepartoftheunavailabilityperiod.Theunavailabilityperiodendsattheonsetof10consecutivenon-SES.These10sarenotconsideredpartoftheunavailabilityperiodunavailablestate:leasedlineconnectionisintheunavailablestateifanunavailabilityperiodisoccurringinoneorbothdirectionsoftransmission3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:BBEBackgroundBlockErrorBISBringingIntoServiceCRC-4CyclicRedundancyCheck-4bitD2048S2048kbit/sdigitalstructuredONPleasedlineD2048U2048kbit/sdigitalstructuredONPleasedlineEMCElectroMagneticCompatibilityESErroredSecondHDB3HighDensityBipolarcodeoforder3NTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBSPseudoRandomBitSequencePRCPrimaryReferenceClockRAIRemoteAlarmIndicationRXRXisasignalinput(ateithertheleasedlineinterfaceorthetestequipment)SESSeverelyErroredSecondSMFSub-MultiFrameTXTXisasignaloutput(ateithertheleasedlineinterfaceorthetestequipment)UIUnitInterval4RequirementsTheperformanceoftheleasedlineshallcomplywiththeserequirementsonlyiftheconditionsofsupplyofthenetworkequipmentprovidingtheNTParemet(e.g.iftheequipmentisconnectedtoanappropriatepowersupplyonthecustomer'spremises).TheITU-Tattributetechniqueisusedtoexpresstheconnectionrequirements.ThefollowingattributesfromITU-TRecommendationI.140arespecifiedinthepresentdocument:-transferrate;-informationtransfersusceptance;-structure;-establishmentofconnection;-symmetry;-connectionconfiguration;-networkperformance.SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)10Thefollowingnetworkperformancesub-attributesareconsideredrelevantforthepresentdocument:-transmissiondelay;-jitter;-slip;-error.4.1AttributesTheconnectionattributesaredisplayedintable1.Ineffect,theseattributesdefinetheservicebeingoffered.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.Table1:ConnectionattributesConnectiontypeattributesValueDescriptionNatureReferenceclauseTransferrateLeasedlinetimingInformationtransferrate2048kbit/s1984kbit/sSee4.1.1.1See4.1.1.2InformationtransfersusceptanceNorestrictiononbinarycontentSee4.1.2StructureFrameintegritySee4.1.3EstablishmentofconnectionWithoutuserinterventionSee4.1.4SymmetrySymmetricalinbothdirectionsSee4.1.5ConnectionconfigurationPoint-to-pointSee4.1.6Networkperformancesub-attributesConnectiontypeattributesValueDescriptionNatureReferenceclauseTransmissiondelayTerrestrialandsatelliteoptionsSee4.1.7.1JitterInputandoutputportsSee4.1.7.2Slip(controlledslip)≤5per24hourperiodSee4.1.7.3Errorparameters(see5.1.7.4)TerrestrialSatelliteEnd-to-endperformanceobjectivesErroredSeconds(ES)ratio<2,000%<3,120%SeverelyErroredSeconds(SES)ratio<0,100%<0,156%BackgroundBlockErrors(BBE)ratio<0,015%<0,023%Performancelevelover24hourperiod(24hourtestlimit)ErroredSeconds(ES)<1645<2592SeverelyErroredSeconds(SES)<68<112BackgroundBlockErrors(BBE)<12732<19933SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)114.1.1Transferrate4.1.1.1LeasedlinetimingRequirement:Theleasedlineshalleither:a)carryusertimingwithintherange2048kbit/s±50partspermillion(ppm);orb)providetimingthatissynchronoustothenetworktiming;orc)takeusertimingwithintherange2048kbit/s±50ppmfromoneinputandprovidethistimingatbothoutputsoftheleasedline.NOTE1:Incaseb),networktimingistimingthatisderivedfromthesourceorsourcesoftimingthatareusedforthenetwork.Thusthetimingprovidedbytheleasedlinewillbesimilartothatprovidedbyotherdigitalservices.NOTE2:Whenthetiminginbothdirectionsisnotsynchronous,thenumberoftransmittedE-bitsdiffersfromthenumberofreceivedSMFs.Asaconsequence,eithersomevalidE-bitsarelostormeaninglessE-bitsareinserted.Test:Thereisnospecifictest;theleasedlineprovidershalldeclarewhichtypeoftimingtheleasedlineprovidesandthisshallbetakenintoaccountduringthesubsequenttestsdefinedinannexA.4.1.1.2InformationtransferrateRequirement:Theconnectionshallbecapableoftransferringanominalinformationrateof1984kbit/swhichiscontainedwithintheframestructuredefinedfortheleasedline(seeclause4.1.3).Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.2InformationtransfersusceptanceRequirement:Theconnectionshallbecapableoftransferringdigitalinformationwithbitsequenceintegrity,andwithoutrestrictiononbinarycontent,atthenominalrateof1984kbit/swithinthedefinedframestructure(seeclause4.1.3).Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.3StructureThepurposeofthestructureistoallowtheleasedlineprovidertomonitortheerrorperformanceoftheleasedlinesfromNTPtoNTP.TheCRC-4is,therefore,notnecessarilytransmittedtransparentlyfromNTPtoNTP;itmaybeupdatedbytheleasedlineprovidertodeterminethelocationoferrors.InordertoallowtheterminalequipmenttomonitortheintegrityofthepathbetweentheterminalequipmentandtheNTP,theNTPisrequiredtoprovideacorrectCRC-4,andtorespondcorrectlywiththeE-bitsintheeventofanincorrectlyreceivedCRC-4.Requirement:Foreachdirectionoftransmission,theleasedlineshallacceptaninputbitstreamwithaframeandmultiframestructureasdefinedinannexB.Whentheleasedlineinputhastheaboveframestructureandtheconnectionisnotintheunavailablestate,theoutputoftheleasedlineshallalsoconformtotheframeandmultiframestructuredefinedinannexB,withthestructurehavingthesamerelationshiptotheinformationtransferredasattheinput,maintainingtheframestructureintegrity.Test:ThetestshallbeconductedaccordingtoclausesA.2.1andA.2.5.1.4.1.3.1CRC-4Requirement:AteachNTP,theCRC-4bitstransmittedintheoutputbitstreamshallbeasdefinedintablesB.1andB.2foracompleteCRC-4multiframeandshallcorrespondtothedatatransmittedattheoutputoftheleasedlineinterface,(i.e.theCRC-4shallberecalculatedintheequipmentprovidingtheNTP).Test:ThetestshallbeconductedaccordingtoclauseA.2.5.1.SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)124.1.3.2UseoftheE-bitsRequirement:AteachNTP,theE-bitstransmittedintheoutputbitstreamshallindicateerroredSMFsintheinputbitstreamatthatNTP.OneE-bitineachmultiframeshallbesettobinaryZEROforeacherroredSMFreceivedintheinputbitstream.TheE-bitscorrespondingtonon-erroredSMFsshallbesettobinaryONE.AnydelaybetweenthedetectionofanerroredSMFandthesettingoftheE-bitthatindicatestheerroredSMFshallbelessthan1s.NOTE:TheintentionisthattheCRC-4verification,andtheassociatedgenerationoftheE-bits,willbeperformedintheequipmentthatprovidestheNTPinordertoindicateonlythoseerrorsthathaveoccurredbetweentheterminalequipmentandtheNTPandnotthoseerrorsthathaveoccurredwithinthenetwork.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.2.4.1.3.3FramesynchronizationanddatatransmissioncapabilityRequirement:Theleasedlineshallcontinuetotransparentlytransmitdataintheeventofreceivingoneortwoconsecutiveincorrectframealignmentsignals.Onreceiptof:-threeconsecutiveincorrectframealignmentsignals;or-therebeing=915erroredSMFsoutof1000SMFs,theleasedlineshallconsiderframealignmenttohavebeenlostandinitiateasearchforframealignmentduringwhichtimetheleasedlinemayceasetransparenttransmissionofdata.NOTE:Someimplementationsmayalsoconsiderframealignmenttohavebeenlostintheeventthatbit2inframesnotcontainingtheframealignmentsignalisinerroronthreeconsecutiveoccasions.ThissituationisunlikelytooccurexceptintheeventofhigherrorratesbetweentheterminalequipmentandtheNTP.Framealignmentshallnotbeconsideredashavingbeenregaineduntil:a)forthefirsttime,thepresenceofthecorrectframealignmentsignal;andb)theabsenceoftheframealignmentsignalinthefollowingframedetectedbyverifyingthatbit2ofthebasicframeisabinaryONE;andc)forthesecondtime,thepresenceofthecorrectframealignmentsignalinthenextframe,inwhichcasetransparenttransmissionofthedatashallcommencewithin20msprovidedthatthedatadoesnotcontainanysimulatedframealignmentwords.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.3.4.1.3.3.1MultiframealignmentRequirement:CRC-4multiframealignmentshallbeachievedifatleasttwovalidCRC-4multiframealignmentsignalscanbelocatedwithin8ms(thetimeseparatingtwoCRC-4multiframealignmentsignalsbeing2msoramultipleof2ms).Ifmultiframealignmentcannotbeachievedwithin8msitshallbeassumedthatframealignmentisduetoaspuriousframealignmentsignalandaresearchforframealignmentshallbeinitiated.NOTE:Theresearchforframealignmentshouldbestartedatapointjustafterthelocationoftheassumedspuriousframealignmentsignal.Thiswillusuallyavoidrealignmentontothespuriousframealignmentsignal.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.4.4.1.3.4UseoftheA-bitThereisnorequirementoftheuseoftheA-bitwithinthepresentdocument.ThevalueoftheA-bitisundefinedattheoutputoftheleasedline.SIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)134.1.3.5UseoftheSabitsThereisnorequirementoftheuseoftheSabitswithinthepresentdocument.ThevaluesoftheSabitsareundefinedattheoutputoftheleasedline.4.1.4EstablishmentofconnectionRequirement:EstablishmentorreleaseoftheconnectionshallnotrequireanyprotocolexchangeorotherinterventionattheNTPbytheuser.Test:Bydeclaration.4.1.5SymmetryRequirement:Theconnectionshallbesymmetrical,i.e.eachdirectionoftransmissionshallhavethesameframestructureandinformationtransfercapability.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.6ConnectionconfigurationRequirement:Theconnectionconfigurationshallbepoint-to-point.Test:Bydeclaration.4.1.7NetworkperformanceThenetworkperformancesub-attributesaredisplayedintable1.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.4.1.7.1TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:-forconnectionswheresatellitetransmissionisnotinvolved,theonewayend-to-enddelayshallbelessthan(10+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure1;or-forconnectionswheresatellitetransmissionisinvolved,theonewayend-to-enddelayshallbelessthan350ms.NOTE:TheserequirementsarebasedonclausesannexA.2andA.3ofITU-TRecommendationG.114.10300060001009000Delay(ms)Geographicaldistance(km)Figure1:UpperlimitofdelaySIST EN 300 419 V1.2.1:2003
ETSIETSIEN300419V1.2.1(2001-07)14Therearenorequirementsforlowfrequency(below20Hz)variationofonewayend-to-enddelayunderthepresentdocument.Test:ThetestshallbeconductedaccordingtoclauseA.2.2.4.1.7.2Jitter4.1.7.2.1JittertoleranceatthenetworkinputportRequirement:Theleasedlineshallfunctionasspecifiedwithinputjitterbeingthesumoftwobandlimitedcomponentsasdefinedintable2.NOTE:Thejittertolerancefortheconnectionisdefinedinthiswayinsteadofspecifyingsinglejitterfrequencies,forthefollowingreasons:-thismethodismorerepresentativeofthejitterencounteredinpractice;and-longregeneratorchainsmaybeespeciallysensitivetosinglejitterfrequencies.Table2:ComponentsofinputjitterFiltersforgenerationofjitterspectrum(firstorder)BandpassfilterformeasurementofinputjitterInputjittermeasuredbybandpassfilterLowercut-off(highpass)Uppercut-off(lowpass)(lowercut-offfirstorder)UnitInterval(UI)peak-to-peak(maximum)Onlylowpass4Hz4Hzto100kHz1,1UI40Hz100kHz40Hzto100kHz0,11UINOTE:Thepurposeofthefirstorderlowpasslinearfilterwithanuppercut-offof4Hzistogenerateaslopeof20dBperdecadefrom4Hzto40Hzontheinputjitterspectrum.Thelevelofjitter(ormorecorrectlywander)generatedbythismethodatfrequenciesbelow4Hzisoftheorderof1UI.Inprinciple,thereisnorequirementforwanderandthiswanderisanunintendedby-productofthemethodofspecifyingthejitter.Inpractice,wanderofthislevelshouldnotcauseanyproblemsforthenetwork.Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.7.2.2MaximumjitteratthenetworkoutputportRequirement:Themaximumjitterattheoutputportofthenetworkshallnotexceedthelimitsspecifiedintable3,whenmeasuredwithlinearfilterswiththedefinedcut-offfrequencies.Atfrequenciesbelowthelower3dBpoint,theattenuationofthehighpassfiltershallrisewithavaluegreaterthan,orequalto,20dBperdecade.Atfrequenciesabovetheupper3dBpoint,theattenuationofthelow
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